Question 702561
The cost to produce 10 units of a product is $40 and the cost to produce 20 units is $70.
 If cost (C) is linearly related to the number of items, (q), produced, find the linear equation that represents this relationship, 
You have two points relating C and q: (10,40) and (20,70)
slope = (70-40)/(20-10) = 3
Form: C = mq + b
You know m = 3 and C = 40 when q = 10.
Solve for "b":
40 = 3*10 + b
b = 10
Equation:
C(q) = 3q + 10
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then use this equation to determine the cost of producing 17 items. 
C(17) = 3*17+10
C(17) = 51+10
C(17) = $61.00
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Cheers,
Stan H.
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